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TCAN1051GV-Q1: TCAN1051GV-Q1 reverse connection of CANH and CANL pins

Tsutomu Hibi
Prodigy 50 points
Part Number: TCAN1051GV-Q1
Other Parts Discussed in Thread: TCAN1051V-Q1

Hi team,

Is this device damaged when the CANH and CANL pins are reversed connected to the vehicle CAN?

I think it is no probrem.

Also, is there any possibility of communication being established at this time?(For a limited number of message)

Best regards.

  • 0
    TI__Mastermind 26826 points

    Hibi-san,

    The device is able to withstand this condition without damage as long as the voltages are kept within the Absolute Maximum Ratings of the device. The limiting differential voltage between the two lines is ±58 V, meaning either CANH>CANL or CANL>CANH. The single-ended voltage limit is also ±58 V referenced to GND.

    The condition you describe is the reason the device is designed this way so that it can withstand accidental reverse-connection conditions.

    Communication would not be possible in this case, as the device is only able to recognize incoming dominant signals when CANH > CANL + 900 mV. Other devices on the network can only drive CANH>CANL, but when this device is reverse-connected, it would only ever receive CANH=CANL or CANH<CANL. The same would be true (vice versa) for when it is attempting to transmit to the bus.

    This condition could cause contention with other devices on the bus, but CAN transmitters have integrated short-circuit current protection that limits current flow in these conditions.

    Also, please consider TCAN1057AV-Q1 which is the newer version of TCAN1051GV-Q1 and TCAN1051V-Q1.

    Best,

    Danny

  • 0
    Prodigy 50 points

    Thanks for the answer.

    This issue has been resolved by your answer.

    Best regards.